TOD readers may find today's blogginheads.tv "Science Saturday" diavlog of some interest. Carl Zimmer speaks with Paul Ehrlich about his latest book. Among the topics covered are "Redesigning cities around people rather than cars" and "Aiming for a world with five billion fewer people".

Go here:
http://bloggingheads.tv/diavlogs/12309

Great Interview! What Ehrlich said that really cracked me up was he told Zimmer, "...if you want to discover the direction that our life support systems are going go into the bathroom look in the toilet and flush. That's where they're going..."